Pick over and wash lentils. Put the lentils, onion, potato and carrot in a large thick-bottomedpan(or a pressure cooker) and add water. Cook until they are all tender.Liquidize in a blender. Put the mixture back in the pan. Add salt, black pepper.In a saucepan put the butter and melted. Add flour and stir with a wood spoon 2-3 minutes thanadd this mixture and tomato puree to the soup.Cook 10-15 minutes more.Sprinkle with paprika and serve!

That is one of my childhood favorites. My mom used to make for all of us!

tips: It is tasty! But some of us don't eat lentils. Lol, lentils give real bad gas and intestinal cramp. I put a teaspoon baking powder when the lentils are boiling, it works! ;)